Dimitri Grinberg has successfully booted an up-to-date Linux on the Intel 4004, the first commercially available microprocessor from 1971.He achieved this by writing a MIPS emulator for the 4004 and paring back the emulated hardware to interface with modern components.The machine is slow, but the accomplishment showcases the detailed architecture of the 4004.This is not the first time the 4004 has been used to emulate another system.